Enhancer regulation for induced WNT3A expression during neuronal regeneration
Chang, C.-Y.; Hung, J.-H.; Wu, C.-C.; Liang, M.-Z.; Huang, P.-Y.; Li, J.; Chen, H.-I.; Yet, S.-F.; Fung, K. S.; Kao, C.-F.; Chen, L.
Show abstract
The treatment of traumatic brain injury (TBI) is limited by a lack of knowledge about the mechanisms underlying neuronal regeneration. WNT family members have been implicated in neurogenesis and aberrant WNT signaling has been associated with neurodegenerative diseases. The current study compared the expression of WNT genes during regeneration of injured cortical neurons. Recombinant WNT3A showed positive effect in promoting neuronal regeneration via in vitro and in vivo TBI models. Intranasal administration of WNT3A protein to TBI mice increased NeuN+ cells compared to control mice as well as retained motor function based on behavior analysis. Since TBI is known to reprogram the epigenome, chromatin immunoprecipitation-sequencing of histone H3K27ac and H3K4me3 was performed to address the transcriptional regulation of WNT3A during neuronal regeneration. We predicted, characterized and proposed that a histone H3K4me1-marked enhancer may undergo topological transformation to regulate the WNT3A gene expression.
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